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The observer pattern defines a one-to-many dependency, allowing multiple observer objects to listen to a topic object at the same time.The second season's program has been upgraded and innovated in an all-round way. In order to promote the transformation of the achievements of "Charming China City," Charming China City? The "City Alliance" was announced and the "Charming Card" program was officially launched to leverage the development of local industries with city brands and inject a strong impetus into the upgrading of cultural and tourism industries.Adapter mode is intended to transform interfaces. It can make two classes that can no longer work together work together, so it is often used in class library reuse, code migration, etc. For example, the DataAdapter class applies the adapter pattern. Adapter mode includes class adapter mode and object adapter mode. The specific structure is shown in the following figure. On the left is class adapter mode and on the right is object adapter mode.船娘就和枫叶一个递一个接，将小舟上家伙都搬上浮舟亭。Gain more recognition from people nearby,